Browsing Waterloo Research by Title
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On a general mixed priority queue with server discretion
(Taylor & Francis, 20161001)We consider a singleserver queueing system which attends to N priority classes that are classified into two distinct types: (i) urgent: classes which have preemptive resume priority over at least one lower priority class, ... 
On Achieving High Survivability in Virtualized Data Centers
(Institute of Electronics, Information and Communication Engineers, 20140101)As businesses are increasingly relying on the cloud to host their services, cloud providers are striving to offer guaranteed and highlyavailable resources. To achieve this goal, recent proposals have advocated to offer ... 
On Aharoni’s rainbow generalization of the Caccetta–Häggkvist conjecture
(Elsevier, 20210501)For a digraph G and v is an element of V(G), let delta(+)(v) be the number of outneighbors of v in G. The CaccettaHaggkvist conjecture states that for all k >= 1, if G is a digraph with n = V(G) such that delta(+)(v) ... 
On estimands arising from misspecified semiparametric ratebased analysis of recurrent episodic conditions
(Wiley, 20191110)Marginal ratebased analyses are widely used for the analysis of recurrent events in clinical trials. In many areas of application, the events are not instantaneous but rather signal the onset of a symptomatic episode ... 
On Eulerian orientations of evendegree hypercubes
(Elsevier, 20180901)It is well known that every Eulerian orientation of an Eulerian 2kedge connected (undirected) graph is strongly kedge connected. A longstanding goal in the area is to obtain analogous results for other types of connectivity, ... 
On fixed points of self maps of the free ball
(Elsevier, 20180701)In this paper, we study the structure of the fixed point sets of noncommutative self maps of the free ball. We show that for such a map that fixes the origin the fixed point set on every level is the intersection of the ... 
On nonequilibrium shrinkage of supercritical CO2 droplets in a watercarrier microflow
(AIP Publishing, 20180716)We report an experimental study on the hydrodynamic shrinkage of supercritical carbon dioxide (scCO(2)) microdroplets during a nonequilibrium process. After scCO(2 )microdroplets are generated by water shearing upon a ... 
On selfadjoint extensions of semigroups of partial isometries
(American Mathematical Society, 2016)Let S be a semigroup of partial isometries acting on a complex, infinite dimensional, separable Hilbert space. In this paper we seek criteria which will guarantee that the selfadjoint semigroup T generated by S consists ... 
On Specht's Theorem in UHF C⁎algebras
(Elsevier, 20210101)Specht's Theorem states that two matrices A and B in Mn(C) are unitarily equivalent if and only if tr(w(A;A )) = tr(w(B;B )) for all words w(x; y) in two noncommuting variables x and y. In this article we examine to what ... 
On symmetric intersecting families of vectors
(Cambridge University Press, 202111)A family of vectors in [k]n is said to be intersecting if any two of its elements agree on at least one coordinate. We prove, for fixed k ≥ 3, that the size of any intersecting subfamily of [k]n invariant under a transitive ... 
On The Complexity Of The Evaluation Of Transient Extensions Of Boolean Functions
(World Scientific Publishing, 20120101)Transient algebra is a multivalued algebra for hazard detection in gate circuits. Sequences of alternating 0's and 1's, called transients, represent signal values, and gates are modeled by extensions of boolean functions ... 
On the measurement of relative powderbed compaction density in powderbed additive manufacturing processes
(Elsevier, 20181005)Experimental studies in the literature have identified the powderbed compaction density as an important parameter, governing the quality of additively manufactured parts. For example, in laser powderbed fusion (LPBF), ... 
On the Number of Trials Needed to Obtain k Consecutive Successes
(Elsevier, 20210430)A sequence of independent Bernoulli trials, each of which is a success with probability p, is conducted. For k ∈ Z+, let Xk be the number of trials required to obtain k consecutive successes. Using techniques from elementary ... 
On the optimal CFL number of SSP methods for hyperbolic problems
(Elsevier, 20190101)We show that the theory for strong stability preserving (SSP) time stepping methods employed with the method of linestype discretizations of hyperbolic conservation laws may result in overly stringent time step restrictions. ... 
On the Road to Making Science of “Art”: Risk Bias in Market Scoring Rules
(The Institute for Operations Research and the Management Sciences, 201806)We study market scoring rule (MSR) prediction markets in the presence of riskaverse or riskseeking agents that have unknown yet bounded risk preferences. It is well known that if agents can be prescreened, then MSRs can ... 
On the role of the microporous layer in PEMFC operation
(Elsevier, 20090301)The condition of liquid water breakthrough at the cathode of polymer electrolyte fuel cells (PEMFC) is studied experimentally and data on corresponding water saturation and capillary pressure are provided for gas diffusion ... 
On the sensitivity of modelled groundwater recharge estimates to rain gauge network scale
(Elsevier, 20200601)Rainfall is often the largest component of the water budget and even a small uncertainty percentage may lead to challenges for accurately estimating groundwater recharge as a calculated residual within a water budget ... 
On the TVD property of second order methods for 2D scalar conservation laws
(arXiv, 20211005)The total variation diminishing (TVD) property is an important tool for ensuring nonlinear stability and convergence of numerical solutions of onedimensional scalar conservation laws. However, it proved to be challenging ... 
On the use of physical boundary conditions for twophase flow simulations: Integration of control feedback
(Elsevier, 20181004)The sensitivity of twophase flow simulations using the Euler–Euler model on the inlet boundary conditions (BCs) is studied. Specifically, the physical relevance of Dirichlet uniform inlet velocity BCs is studied which are ... 
Onchip cell lysis by antibacterial nonleaching reusable quaternary ammonium monolithic column
(Springer US: Biomedical Microdevices, 20151216)Reusable antibacterial nonleaching monolithic columns polymerized in microfluidic channels designed for onchip cell lysis applications were obtained by the photoinitiated free radical copolymerization of diallyldimethylammonium ...